US11380122B2 - Fingerprint identification device - Google Patents

Fingerprint identification device Download PDF

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US11380122B2
US11380122B2 US16/639,608 US201916639608A US11380122B2 US 11380122 B2 US11380122 B2 US 11380122B2 US 201916639608 A US201916639608 A US 201916639608A US 11380122 B2 US11380122 B2 US 11380122B2
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light
fingerprint identification
detection circuit
light emitting
identification device
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US20210133417A1 (en
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Jifeng TAN
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134372—Electrodes characterised by their geometrical arrangement for fringe field switching [FFS] where the common electrode is not patterned
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1341—Sensing with light passing through the finger

Definitions

  • the present disclosure relates to the field of fingerprint identification, and more particularly, to a fingerprint identification device.
  • fingerprint identification has been widely used in many fields.
  • fingerprint identification has been implemented in electronic equipment terminals such as mobile phones, tablet computers and televisions, and security protection systems such as access control and vaults.
  • the implementation of fingerprint collection typically includes optical, capacitive, and ultrasonic imaging technologies. Among them, the identification range of optical fingerprint identification technology is relatively large and the cost is relatively low.
  • a fingerprint pattern is usually identified by using backlight to illuminate the finger, which then diffusely reflects the light beam to the photoelectric sensor device.
  • FIG. 12 A specific example is shown in FIG. 12 . After the backlight is used as the light source to illuminate the finger, the light beam is diffusely reflected by the finger. Part of the light beam will be received by the photoelectric sensor.
  • the diffusely reflected light energy will be different between the light received from the wave valley (referred to as “valley” here below) of the fingerprint and that from the wave peak (referred to as “ridge” here below) thereof, and the light energy corresponding to the valleys is lower than that corresponding to the ridges, thereby performing fingerprint identification based on the difference.
  • the light energy of the backlight beam in the above-mentioned liquid crystal display after passing through the liquid crystal layer twice to the photoelectric sensor is very low, and the photoelectric sensor only receives a small part of light beam diffusely reflected by the finger.
  • the difference in light energy between the valleys and ridges of the fingerprints are extremely small.
  • the present disclosure is directed to provide a fingerprint identification device, so as to improve the accuracy of fingerprint identification.
  • a fingerprint identification device including: an array substrate, a light emitting unit, a light detection circuit and a light adjusting structure, where the light emitting unit and the light detection circuit are disposed between the array substrate and the light adjusting structure, the light detection circuit is configured to receive light emitted from light emitting unit after being reflected by a user fingerprint and passing through the light adjusting structure; and where the light adjusting structure includes at least a first region and a second region having different refractive indexes, and a refractive index of the first region corresponding to a light receiving range of the light detection circuit is greater than another refractive index of the second region corresponding to outside of the light receiving range of the light detection circuit.
  • a terminal device including the fingerprint identification device described above.
  • FIG. 1 illustrates a schematic structural diagram of a fingerprint identification device according to an exemplary embodiment of the present disclosure
  • FIG. 2 illustrates a schematic structural diagram of a fingerprint identification device according to an exemplary embodiment of the present disclosure
  • FIG. 3 illustrates a schematic diagram of upper and lower electrodes in a fingerprint identification device according to an exemplary embodiment of the present disclosure
  • FIG. 4 illustrates an arrangement of light emitting units and light detection circuits according to an exemplary embodiment of the present disclosure
  • FIG. 5 illustrates another arrangement of light emitting units and light detection circuits according to an exemplary embodiment of the present disclosure
  • FIG. 6 illustrates a deflection state of liquid crystal
  • FIG. 7 illustrates another deflection state of liquid crystal
  • FIG. 8 illustrates a schematic diagram of a refractive index of a liquid crystal layer in a light adjusting structure
  • FIG. 9 illustrates a schematic diagram of an optical path of a large-angle incident light beam passing through a light adjusting structure
  • FIG. 10 illustrates a schematic diagram of an optical path of a small-angle incident light beam passing through a light adjusting structure
  • FIG. 11 illustrates a schematic diagram of an optical effect of a fingerprint detection device provided by an embodiment of the present disclosure.
  • FIG. 12 illustrates a schematic diagram of an optical fingerprint identification device in related art.
  • FIG. 1 illustrates a schematic side-view structural diagram of a fingerprint identification device according to an exemplary embodiment of the present disclosure.
  • the fingerprint identification device includes an array substrate 21 , a plurality of light emitting units 22 , a light detection circuit 23 , a polarizer 24 , and a light adjusting structure 25 .
  • the plurality of light emitting units 22 are disposed on the array substrate 21 .
  • the light detection circuit 23 is disposed on the array substrate 21 and dispersed in a gap between the plurality of light emitting units 22 .
  • the polarizer 24 is disposed on the array substrate 21 .
  • the light adjusting structure 25 is disposed on the polarizer 24 .
  • the light adjusting structure 25 generates different refractive indexes, and a refractive index of the light adjusting structure corresponding to a light receiving range of the light detection circuit 23 is greater than another refractive index of the light adjusting structure outside the light receiving range of the light detection circuit 23 .
  • a light adjusting structure is disposed on the polarizer and generates different refractive indexes, where a refractive index of the light adjusting structure corresponding to a light receiving range of the light detection circuit is greater than another refractive index of the light adjusting structure outside the light receiving range of the light detection circuit.
  • a refractive index of the light adjusting structure corresponding to a light receiving range of the light detection circuit is greater than another refractive index of the light adjusting structure outside the light receiving range of the light detection circuit.
  • the light detection circuit is dispersed in the gap between the plurality of light emitting units, that is, the light detection circuit and the light emitting units are disposed on the same layer, thereby reducing the size (e.g., thickness) of the fingerprint identification device and further increasing the integration of the fingerprint identification device.
  • FIG. 2 illustrates a schematic side-view structural diagram of a fingerprint identification device according to an exemplary embodiment of the present disclosure.
  • the light adjusting structure 25 includes an upper substrate 251 , a lower substrate 252 , and a liquid crystal layer 253 sandwiched between the upper substrate 251 and the lower substrate 252 .
  • the upper substrate 251 is configured to receive a user fingerprint.
  • the light adjusting structure 25 further includes the polarizer 24 , which is disposed on the array substrate 21 .
  • the plurality of light emitting units 22 and the light detection circuit 23 are provided in a packaging layer 26 .
  • the polarizer may be a linear polarizer, for example, a + ⁇ /4 retarder, and may be disposed between the packaging layer 26 and the lower substrate 252 .
  • the light transmission axis of the polarizer may be parallel to the long axis of the liquid crystal molecules.
  • the lower substrate 252 may be provided thereon with a plurality of separated lower electrodes 252 a
  • the upper substrate 251 may be provided thereon with an upper electrode 251 a , as shown in FIG. 3 .
  • the lower electrodes 252 a and the upper electrode 251 a are configured to form a vertical electric field, and the liquid crystal is initially vertically aligned.
  • It may further include a driving circuit (not shown in the drawing) connected to the upper electrode 251 a and the lower electrodes 252 a , respectively, which is configured to apply a voltage to the upper electrode 251 a and the lower electrodes 252 a respectively, causing the liquid crystals to form different deflections.
  • the driving circuit may be various devices or circuits for applying a voltage to drive deflection of the liquid crystal, and may be, for example, an integrated circuit (IC) or the like that applies an electrical signal.
  • the plurality of light emitting units may include a plurality of white light emitting devices, and a plurality of light detection circuits are provided in a gap between the plurality of white light emitting devices on the array substrate.
  • FIG. 5 illustrates an arrangement of light emitting units and light detection circuits according to an exemplary embodiment of the present disclosure.
  • a plurality of white light emitting devices e.g., white LEDs
  • a plurality of light detection circuits e.g., photosensitive sensor
  • the plurality of light emitting units include a plurality of light emitting sets, each of the light emitting sets includes a red light emitting device, a green light emitting device, and a blue light emitting device.
  • One light detection circuit is disposed in a gap of each set on the array substrate.
  • FIG. 4 illustrates an arrangement of light emitting units and light detection circuits according to an exemplary embodiment of the present disclosure. As shown in FIG.
  • the plurality of light emitting units include a plurality of light emitting sets 22 L, each light emitting set includes a red light emitting device 22 R (e.g., a red LED), a green light emitting device 22 G (e.g., a green LED), and a blue light emitting device 22 B (e.g., a blue LED).
  • a light detection circuit 23 e.g., a photosensitive sensor
  • the light emitting units may be implemented by various light emitting devices, for example, an organic light emitting diode (OLED) may be adopted, and the present disclosure is not limited thereto.
  • OLED organic light emitting diode
  • the purpose of fingerprint identification can be achieved according to the difference of light intensity received by the detection unit.
  • the liquid crystal in the light adjusting structure is arranged vertically (vertically aligned), and the liquid crystal layer is inactive and is in a sleep state (see FIG. 3 ).
  • the light adjusting structure includes a plurality of active regions (e.g., the multiple layers as shown in FIGS. 6, 7, 9 and 10 ), and each active region may have a projection on the array substrate corresponding to one light detection circuit.
  • the active region may be defined with a pixel period D of the light adjusting structure, and each pixel period D satisfies: (the width of the light detection circuit) ⁇ D ⁇ (the width of the light detection circuit+the width of the light emitting unit), and the size of D may be determined according to a process limit for the width of electrode slit and the required number of layers having different refractive indexes.
  • a width d of each layer of refractive index may substantially correspond to a size of each lower electrode 252 a.
  • the voltage signal of the upper electrode on the upper substrate is fixed, and different pixel voltages are applied to the lower electrodes of the upper substrate and the lower substrate, so as to realize a symmetrical deflection of liquid crystal as shown in FIG. 6 , or a mirrored deflection of liquid crystal as shown in FIG. 7 .
  • the refractive indexes are large in the middle and small at both sides. Specifically, within each pixel period D, the refractive index of the light adjusting structure corresponding to a light receiving range of the light detection circuit is greater than the refractive index of the light adjusting structure outside the light receiving range of the light detection circuit.
  • One pixel period D may correspond to one light detection circuit.
  • the refractive index is ne, exemplarily about 1.9
  • the refractive index at the edge part of one pixel period is no, exemplarily about 1.5
  • a transition region between the edge part and the center part forms therein a gradient of refractive indexes n 1 , n 2 , . . . .
  • FIG. 8 illustrates a schematic diagram of a refractive index of a liquid crystal layer in the light adjusting structure.
  • FIG. 9 illustrates a schematic diagram of an optical path of a large-angle incident light beam passing through the light adjusting structure. It can be understood from the optical path shown in FIG. 9 that the fingerprint identification device provided by the present disclosure can refract large-angle incident light.
  • the principle of deflection of a light beam in a gradient index substrate can be used, wherein the refractive index distribution of the medium is n 1 ⁇ n 2 ⁇ n 3 . . . ⁇ nx.
  • the angle between refracted beam and the interface normal gradually decreases, and the reflection and total reflection of the beam at the interface of the mediums are suppressed because the refractive index changes continuously, the beam is always refracted and emitted.
  • FIG. 10 illustrates a schematic diagram of an optical path of a small-angle incident light beam passing through the light adjusting structure. Because the refractive index is the largest at the middle part of the gradient refractive index material, the light incident from directly above will be limited, according to the angle of incidence, within one or more middle layers for total reflection propagation, ensuring that the light detection circuit only receives a part of the light that incident directly above it.
  • FIG. 11 illustrates a schematic diagram of an optical effect of a fingerprint detection device provided by an embodiment of the present disclosure, in which the dotted lines indicate light beams.
  • a light adjusting structure is formed above the packaging layer.
  • the light adjusting structure has gradient distributed refractive indexes, that is, the refractive indexes exhibit a distribution of large in the middle and small at both sides. For light incident at a large angle, it will be deflected to the horizontal direction and emitted out, thereby reducing the effect of interference light on the light detection circuit. For the light incident directly above, it will be limited to propagate in the vertical direction of the gradient index material, thereby increasing the intensity of light received by the light detection circuit from directly above.
  • optical fingerprint identification is performed using only light that satisfies the above-mentioned conditions, and the light that does not meet the above conditions will not be limited within the waveguide. But the latter part of light may be received by the light detection circuit through refraction and reflection of each film layer. Since this part of stray light always exists, a clearance correction may be performed after the fingerprint identification device structure is formed. For example, the stray light received by the light detection circuit can be recorded before fingerprint identification, that is, the value difference between valleys and ridges of the fingerprint can be identified based on the stray light intensity.
  • the light detection circuit is provided between the light emitting units. Due to the reflectivity difference between valleys and ridges of the fingerprint to the incident light, fingerprint identification can be achieved according to the difference in light intensity received by the light detection circuit.
  • the light adjusting structure is provided above the light detection circuit. Different voltages can be applied to different positions of the liquid crystal layer to achieve different deflection angles of the liquid crystal, thereby achieving different refractive indexes (change from no to ne) of the liquid crystal layer to incident polarized light.
  • the refractive indexes to incident polarized light exhibit a distribution of large in the middle and small at both sides. For light incident at a large angle, it will be deflected to the horizontal direction and emitted out, thereby reducing the effect of interference light on the light detection. For the light incident directly above, it will be limited to propagate in the vertical direction of the gradient index material, thereby increasing the intensity of light received by the light detection circuit from directly above. Therefore, the fingerprint identification device provided by the embodiments of the present disclosure can reduce interference and improve the accuracy of fingerprint identification.

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CN201810497018.5A CN108734134A (zh) 2018-05-22 2018-05-22 指纹识别装置
CN201810497018.5 2018-05-22
PCT/CN2019/087482 WO2019223626A1 (zh) 2018-05-22 2019-05-17 指纹识别装置

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CN108734134A (zh) * 2018-05-22 2018-11-02 京东方科技集团股份有限公司 指纹识别装置
CN109581747A (zh) 2019-01-02 2019-04-05 京东方科技集团股份有限公司 光源模组和显示模组
CN110045557B (zh) * 2019-03-22 2021-06-01 武汉华星光电技术有限公司 显示面板及显示装置
CN110135405B (zh) * 2019-06-26 2023-03-10 京东方科技集团股份有限公司 指纹识别模组、阵列基板及其制作方法和液晶显示面板
CN110287920B (zh) * 2019-06-29 2021-11-19 厦门天马微电子有限公司 一种显示面板及显示装置
CN112684620B (zh) 2019-10-18 2023-01-03 上海耕岩智能科技有限公司 一种图像采集装置
CN110944073A (zh) * 2019-10-29 2020-03-31 武汉华星光电技术有限公司 屏下指纹识别装置及显示装置
CN111081157A (zh) * 2019-12-24 2020-04-28 维沃移动通信有限公司 显示模组、屏幕组件、电子设备、提示方法和拍摄方法
CN111552109A (zh) * 2020-06-09 2020-08-18 京东方科技集团股份有限公司 一种显示模组及其驱动方法、显示装置

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